Buchla Q: Noisy & Quiet Ground

[Goddard, Duncan]

>>The Noisy and Quiet grounds ran all the way back to the supplies on
separate
> wires and were joined at the supply terminals. Quiet ground was mostly
> used
> as the reference for the + terminals of op-amps and carries no significant
> current. Anything that switched any significant amount of current
> connected
> to noisy ground so the IR drops wouldn't show up as signals in the audio
> path.<<
> 
whole buildings are wired in a similar way to this, particularly radio and
tv broadcasters and facilities houses, and probably most big computer
installations- we call them tech earth and cooking earth, tho' in practice
usually the whole supply will be separate to keep the neutral quiet aswell.

d.


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